Low profile passive protector for an i.v. catheter

ABSTRACT

A low-profile universal passive protector is provided for an IV catheter comprising a hypodermic needle and a catheter. An elongate sheath defines a sheath cavity and a longitudinal axis. A slider is connected to the hypodermic needle and is movable along the sheath between first and second positions for withdrawing the needle into the sheath. A finger-press plate is coupled to the sheath and extends beyond the slider in a direction perpendicular to the longitudinal axis to define a plate height. A flashback body is coupled to the slider in a manner such that the flashback body and slider collectively define a cavity in fluid communication with the hypodermic needle. The flashback body is sized and configured to extend from the slider in a direction perpendicular to the longitudinal axis to define a flashback body height that is less than the plate height.

CROSS-REFERENCE TO RELATED APPLICATIONS

Not Applicable

STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT

Not Applicable

BACKGROUND

1. Technical Field

The present disclosure relates generally to a universal passiveprotector for an IV catheter, and more specifically to a universalpassive protector having a low-profile flashback chamber relative to afinger-press plate to define a more ergonomically friendlyconfiguration, which in turn, simplifies withdrawal of a hypodermicneedle after placement of the catheter within the patient's vein.

2. Related Art

It is well known in the medical profession that various medicaltreatments and procedures oftentimes require the insertion or withdrawalof fluid from a patient. Intravenous needles are commonly employed toachieve such insertion or withdrawal of fluid. However, in someinstances, the needle may be required to remain in the patient for anextended period of time, such as when introducing or withdrawing largeamounts of fluid. Under these circumstances, metal needles are typicallyunfavorable due to their rigid structure and sharp distal tip which cancause trauma to the patient's vein. In view of the disadvantagesassociated with metal needles, medical professionals commonly use acatheter for such applications.

A conventional catheter typically includes a generally flexible tubehaving a hard/rigid distal tip. The catheter is typically inserted intoa patient's vein using a catheter introduction device. Various catheterintroduction devices have been developed and include through-the-needlecatheters, as well as over-the-needle catheters. A through-the-needlecatheter is inserted into an anatomical passage of the patient throughthe use of a cannula, which typically includes an elongate, metal needlewhich punctures the skin, tissue and vein wall to provide a path forplacement of the catheter in the vein. When the needle pierces the vein,blood will “flashback” through the needle and into a flashback chambertypically located at the proximal end of the needle. Thus, the“flashback” is an indication to the medical technician that the needlehas been properly inserted into the vein. At this point, the catheter ismaintained stationary within the vein and the needle is withdrawn andremoved from the catheter. The needle may have score lines formedtherein to allow a medical technician to tear or pull the needle apartto remove the needle from the catheter once the catheter is removed fromthe patient.

Over-the-needle catheters are also commonly used by medical technicians,and typically include a thin catheter having a hub attached to itsproximal end. The catheter is advanced over a rigid cannula, such as aneedle, with the cannula and catheter being simultaneously advanced intoa desired anatomical passage of a patient. Once the catheter has beeninserted into the anatomical passage of the patient, the cannula istypically removed from the catheter by retracting the cannula throughthe catheter. The action of retracting the cannula can undesirablyexpose the medical technician as well as the patient to accidentalcontact with the cannula, particularly the piercing tip of the needle.Such accidental needle sticks are a serious concern in view of suchdiseases as Acquired Immune Deficiency Syndrome (“AIDS”), which can betransmitted through the exchange of bodily fluids with an infectedperson. In particular, a needle that has been used to place a catheterin the vein of an AIDS infected person may be a vehicle for transmissionof the disease to the medical technician.

A number of protective devices have been developed recently to helpreduce the incidence of disease and transmission through needle sticks.Many of the protective devices employ a protective, elongate sheath intowhich the needle is retracted as the needle is withdrawn from thepatient. Along these lines, when the needle is withdrawn, its sharpdistal tip is safely enclosed within the sheath, which is typicallyformed from a rigid material.

Operation of the protective devices generally includes an actuationmechanism connected to the needle, which is operated by the fingers ofthe medical technician. The technician uses various structures on theprotective device to push against or pull on for retracting the needlewithin the sheath. However, in many protective devices, the flashbackchamber is positioned in a manner which makes it difficult for themedical technician to easily grasp and manipulate the protective devicein its intended manner. Such difficulty may lead to improper operationof the protective device, which may lengthen the process of insertingthe catheter, or compromise the protective nature of the device.

Accordingly, there is a need in the medical field for an improvedprotective device that is sized and configured to facilitate withdrawalof the needle within a protective element. The present inventionaddresses this need, as will be discussed in more detail below.

BRIEF SUMMARY

According to an aspect of the invention, there is provided a universalpassive protector having a low-profile flashback chamber which forms amore ergonomically compatible configuration relative to prior artpassive protectors. The ergonomically friendly configuration allows themedical technician's fingers to easily interface with a finger-pressplate for properly operating the protector when withdrawing the needletherein after insertion of the catheter into the patient. Despite thereduced profile of the flashback chamber, the flashback chamber isconfigured to perform its conventional function of providing a visualindication that the catheter has been properly inserted into thepatient's vein. However, the low-profile of the flashback chamberminimizes interference with the fingers of the medical technician toallow the medical technician to easily operate the device.

According to one embodiment, there is provided a low-profile universalpassive protector for an IV catheter comprising a hypodermic needle andan over-the-needle catheter removeably disposed about the hypodermicneedle. An elongate sheath is detachably engaged with theover-the-needle catheter and defines a sheath cavity and a longitudinalaxis. A slider is connected to the hypodermic needle and is movablealong the sheath between a first position and a second position, suchthat the hypodermic needle is drawn into the sheath cavity as the slidermoves from the first position toward the second position. A finger-pressplate is coupled to the sheath and extends beyond the slider in adirection perpendicular to the longitudinal axis to define a plateheight. A flashback body is coupled to the slider in a manner such thatthe flashback body and slider collectively define a cavity in fluidcommunication with the hypodermic needle. The flashback body is sizedand configured to extend from the slider in a direction perpendicular tothe longitudinal axis to define a flashback body height that is lessthan the plate height.

The slider may include a first end and an opposing second end, whereinthe first end faces the finger-press plate. The flashback body may becoupled to the slider such that no portion of the flashback body extendsfrom the slider beyond the second end.

The flashback body height may be less than ⅓ of the plate height. Theflashback body may include a flashback plate and a flashback cylindercoupled to the flashback plate, wherein the flashback plate defines aplane that is substantially parallel to the longitudinal axis, and theflashback cylinder defines a cylinder axis substantially parallel to thelongitudinal axis. The flashback cylinder may define an opening whichextends into the flashback plate. The flashback cylinder may beintegrally formed with the flashback plate. The flashback cylinder mayinclude a curved end portion and an open end portion opposite the curvedend portion, wherein the flashback cylinder is arranged such that thecurved end portion faces the finger-press plate. The curved end portionmay intersect with the flashback plate at the approximate midpoint ofthe slider in a longitudinal cross section generally perpendicular tothe flashback plate.

The protector may include a locking element coupled to the sheath andextending into the sheath cavity. The slider may be configured to engagewith the locking element when the slider is in the second position so asto lock the slider in place. The locking element may include a lockingtab which engages with a corresponding locking tab on the slider whenthe slider is in the second position.

The presently contemplated embodiments will be best understood byreference to the following detailed description when read in conjunctionwith the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features and advantages of the various embodimentsdisclosed herein will be better understood with respect to the followingdescription and drawings, in which:

FIG. 1 is an upper perspective view of a low-profile universal passiveprotector constructed in accordance with an embodiment of the presentinvention, the universal passive protector having a cover coupledthereto and extending over a hypodermic needle and an over-the-needlecatheter;

FIG. 2 is an upper perspective view of the universal passive protectorand cover, with the cover removed from the universal passive protectorto expose the hypodermic needle and the over-the-needle catheter;

FIG. 3 is a top plan view of the universal passive protector;

FIG. 4 is a side view of the universal passive protector;

FIG. 5 is an enlarged, partial, side sectional view of the universalpassive protector illustrating a low-profile height relative to afinger-press plate;

FIG. 5A is an enlarged side sectional view of the distal end of thecatheter positioned on the needle;

FIG. 6 is an upper perspective view showing use of the universal passiveprotector for inserting a catheter into a patient;

FIG. 7 is a side view of the universal passive protector with the sliderand needle in a deployed configuration;

FIG. 8 is a side view of the universal passive protector with the sliderand needle transitioned toward a retracted configuration;

FIG. 9 is an upper perspective view of the catheter detached from thesheath and inserted in a patient; and

FIG. 10 is a top view of the catheter detached from the sheath and thehypodermic needle retracted within the sheath.

Common reference numerals are used throughout the drawings and thedetailed description to indicate the same elements.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of the presently preferredembodiments of the invention, and is not intended to represent the onlyform in which the present devices may be developed or utilized. It is tobe understood, however, that the same or equivalent functions may beaccomplished by different embodiments that are also intended to beencompassed within the spirit and scope of the invention. It is furtherunderstood that the use of relational terms such as first, second, andthe like are used solely to distinguish one from another entity withoutnecessarily requiring or implying any actual such relationship or orderbetween such entities.

Referring now to the drawings, wherein the showings are for purposes ofillustrating a preferred embodiment of the present invention only, andare not for purposes of limiting the same, there is depicted alow-profile, universal passive protector 10 for use in inserting anover-the-needle IV catheter 12 into a patient. The universal passiveprotector 10 includes a hypodermic needle 14 that is configured to bewithdrawn into a sheath 16 in response to movement of a slider 18 alongthe sheath 16 from a deployed position to a retracted position. Theslider 18 is specifically configured and adapted to include a flashbackchamber 20 (see FIG. 5) which defines a low-profile in relation to afinger-press plate 22 to allow a healthcare technician to easily graspthe slider 18 with the technician's thumb and middle finger, whilepressing the against the finger-press plate 22 with the technician'sindex finger for moving the slider 18 along the sheath 16.

The sheath 16 is an elongate member which defines a longitudinal axis 24and includes a top surface 26, a pair of opposed side surfaces 28, 30, abottom surface 32, and a sheath cavity 34 extending into the sheath 16from the top surface 26 thereof along the length of the sheath 16. Theexemplary embodiment of the sheath 16 defines a substantiallyquadrangular cross section, although those skilled in the art willappreciate that the sheath 16 may define a variety of alternativecross-sectional shapes without departing from the spirit and scope ofthe present invention.

The slider 18 is slidably connected to the sheath 16 and is moveablealong the length of the sheath 16 between a first, extended position anda second, retracted position. The slider 18 is rigidly connected to theneedle 14 such that movement of the slider 18 from the extended positiontoward the retracted position causes the needle 14 to retract into thesheath cavity 34, as will be described in more detail below. The slider18 includes a slider locking tab 19 (see FIG. 5) which engages with adistal needle lock 15 for locking the slider 18 in retracted position.When the slider 18 is locked in the retracted position, the engagementbetween the distal needle lock 15 and the slider 18 restricts/preventsmovement of the slider 18 from the retracted position toward theextended position so as to maintain the needle 14 within the sheath 16for preventing inadvertent needle sticks.

The distal needle lock 15 (i.e., a locking element) is coupled to thesheath 16 and extends into the sheath cavity 34 such that the slider 18engages with the distal needle lock 15 when the slider 18 is in theretracted position. The particular embodiment of the distal needle lock15 includes a locking tab 17, which is configured to engage with aslider locking tab 19 formed on the slider 18 when the slider 18 is inthe fully retracted position. In particular, the slider locking tab 19extends over the distal needle lock tab 17 and into a locking cavity 21formed behind the locking tab 17 to capture the slider locking tab 19therein. By capturing the slider locking tab 19, movement of the slider18 along the sheath 34 is prevented.

A flashback body 36 is connected to the slider 18 such that theflashback body 36 and the slider 18 collectively define the flashbackchamber 20, which is in fluid communication with the fluid passagewaydefined by the hypodermic needle 14. The flashback chamber 20 fills withblood when the needle 14 is inserted into a patient's vein so as toprovide a visual indication to the medical technician that the needle 14and catheter 12 are properly positioned.

The finger-press plate 22 is coupled to the sheath 16 and extendsupwardly therefrom. The finger-press plate 22 is specifically sized andconfigured to serve as a push-off point for the medical technician'sindex finger when transitioning the slider from the extended positiontoward the retracted position, as discussed in more detail below.

One aspect of the present invention pertains to the height differentialbetween the flashback body 36 and the finger-press plate 22. Inparticular, the flashback body 36 is specifically sized and configuredto define a low-profile relative to the finger-press plate 22 to allowthe medical technician's index finger to easily interface with thefinger-press plate 22. In this regard, the flashback body 36 does notinterfere with the medical technician's index finger when the slider 18is positioned adjacent the finger-press plate 22 (i.e., when the slider16 is in the extended position).

The finger-press plate 22 extends from the sheath 16 in a directionsubstantially perpendicular to the longitudinal axis 24 beyond an uppersurface 38 of the sider 18 to define a plate height “P.” The flashbackbody 36 extends above the upper surface 38 of the slider 18 in adirection substantially perpendicular to the longitudinal axis 24 todefine a flashback body height “F.” The flashback body height F is lessthan the plate height P, and is preferably substantially less than theplate height P. In one embodiment, the flashback body height F is lessthan ⅓ of the plate height P, and in other embodiments, the flashbackbody height F is significantly less than ⅓ of the plate height P. Inthis regard, the plate height P may be increased in various embodimentsof the universal passive protector 10 to increase the heightdifferential between the plate height P and the flashback body height Fso as to make it easier for the medical technician to interface with thefinger-press plate 22 during use of the protector 10.

According to another aspect of the present invention, the flashback body36 is additionally configured so as not to extend beyond the slider 18in a direction parallel to the longitudinal axis 24. Along these lines,the slider 18 includes a first end 40 and an opposing second end 42,wherein the first end faces the finger-press plate 22 and the second end42 faces away from the finger-press plate 22. The flashback body 36 ispreferably confined between the planes defined by the opposing first andsecond ends 40, 42.

In one embodiment, the flashback body 36 includes a flashback plate 44and a flashback cylinder 46 coupled to the flashback plate 44. In apreferred embodiment, the flashback cylinder 46 is integrally formedwith the flashback plate 44, although those skilled in the art willrecognize that non-integral configurations may be employed withoutdeparting from the spirit and scope of the present invention. Theflashback plate 44 defines a plane that is substantially parallel to thelongitudinal axis 24, and the flashback cylinder 46 defines a cylinderaxis substantially parallel to the longitudinal axis 24. According toone implementation, the flashback cylinder 46 defines an openingdisposed about the cylinder axis and sized to at least partially extendinto the flashback plate 44, as can be seen in FIGS. 1 and 2, whereinthe lower end of the opening extends partially into the flashback plate44.

The flashback cylinder 46 includes a curved end portion 48 and an openend portion 50 opposite the curved end portion 48. The flashbackcylinder 46 is arranged such that the curved end portion 48 faces thefinger-press plate 22. The curved end portion 48 intersects with theflashback plate 44 at the approximate midpoint of the slider 18 (i.e.,between the first and second ends 40, 42) in a longitudinal crosssection generally perpendicular to the flashback plate 44. In oneimplementation, the opening defined by the flashback cylinder 46 is toosmall to engage with conventional fluid insertion or extraction devices.In this regard, the fluid insertion or extraction devices interfacedirectly with the catheter 12 for such procedures.

A plug 52 is inserted within the flashback cylinder opening to preventblood from exiting the flashback cavity 34. The plug 52 is preferablyconfigured to allow gases to pass therethrough, while restricting thepassage of liquids therethrough.

As noted above, movement of the slider 18 from the extended positiontoward the retracted position causes the needle 14 to retract into thesheath 16. Along these lines, the sheath 16 includes an opening 54 (seeFIG. 5) in communication with the sheath cavity 34 and through which theneedle 14 extends. The needle 14 includes a proximal portion 56 coupledto the slider 18 and an opposing distal portion defining a sharp distaltip 58 which slightly protrudes from a distal end of the catheter 12.

The catheter 12 defines a proximal end portion 60, a distal end portion62, and a catheter passageway extending between the proximal and distalend portions 60, 62. The catheter 12 includes a hub 64 positionedadjacent the proximal end portion 60. A catheter tube 55, formed of asoft, flexible material, is attached to the hub 64. The catheter tube 55is configured to be inserted into a patient's vein, thereby providing apath for intravenous injection or aspiration of the patient. Along theselines, the hub 64 is configured to be engageable withinjection/aspiration devices via a threaded luer lock.

FIG. 5A shows an enlarged, partial side sectional view of an embodimentof the distal end portion 62 of the catheter 12. The catheter 12includes a hardened distal tip 61 having an exposed segment 63 and aninsertion segment 67, wherein the insertion segment 67 is disposedwithin the catheter tube 55. The insertion segment 67 is sized andconfigured to abut against a shoulder 71 formed on the needle 14,wherein the outer diameter of the needle 14 transitions to a reduceddiameter at the distal end thereof. The abutment between the hardeneddistal tip 61 and the shoulder 71 prevents the catheter 12 fromgathering or bunching up as the catheter 12 is inserted into thepatient. In this regard, the catheter tube 55 is typically notfrictionally engaged with the needle 14 and is formed from asoft-flexible material such that if the hardened distal tip 61 did notengage with the shoulder 71, the catheter tube 55 would likely gatherand bunch up over the needle 14 as the needle 14 is advanced into thepatient.

Although FIG. 5A shows the hardened distal tip 61 and the catheter tube55 as being separate elements which are joined together, it isadditionally contemplated that the hardened distal tip 61 and thecatheter tube 55 may be co-molded together so as to form a unitary body.

A detachable cover 65 may be placed over the needle 14 and catheter 12before using the protector 10 to protect the medical technician from aninadvertent needle stick. Along these lines, the cover 65 is removedbefore the needle 14 and catheter 12 are inserted into the patient.

The sheath 16 is connected to a pair of retractable arms 66 (i.e., jaws)specifically configured and adapted to engage with the hub 64 when theslider 18 is in the extended position, and to release the hub 64 as theslider 18 transitions to the retracted position. The arms 66 arepivotally connected to the sheath 16 and are moveable between a closedposition, wherein the arms 66 engage with the hub 64, and an openposition, wherein the arms 66 release the hub 64. According to oneembodiment, the arms 66 are biased toward the open position, such thatwhen the needle 14 is retracted within the sheath 16, the arms 66release the hub 64.

In one implementation of the present invention, and referring nowspecifically to FIG. 10, each arm 66 includes a primary arm body 68having a proximal segment coupled to the sheath 16, and a distal segment70 configured to capture the hub 64 of the catheter 12 when the arms 66are in the closed position. The arms 66 are connected to the sheath 16such that the primary arm bodies 68 are arranged in generally opposedrelation to each other and define a hub receiving cavity 72therebetween. Each arm 66 additionally includes a secondary arm body 74coupled to the primary arm body 68 and extending into the hub receivingcavity 72. The secondary arm bodies 74 are configured to interlock witheach other and cover the opening 54 of the sheath 16 through which theneedle 14 is retracted when the needle 14 is in the fully retractedposition. According to one embodiment, one secondary arm body includes aslot while the other secondary arm body includes a pin or post whichresides within the slot to interlock the secondary arm bodies 74 to eachother. The secondary arm bodies 74 each include a central apertureformed therein to accommodate passage of the needle therethrough. Thecentral apertures are co-axially aligned with each other when the arms66 are in the closed position, to thereby allow the needle 14 to extendthrough each aperture. When the needle 14 is captured within the sheath16, and the arms 66 transition to the open position, the apertures moveinto a non-aligned configuration, which effectively prevents the needle14 from leaving the sheath 16. A spring 76 is engaged with the arms 66and biases the arms 66 toward their open position.

The foregoing describes an exemplary embodiment of the arms 66. For amore detailed discussion of the arms 66, please refer to U.S. Pat. No.6,981,965, entitled Universal Passive Protector for an IV Catheter, thecontents of which are expressly incorporated herein by reference.

With the basic structural features of the device 10 described above, thefollowing discussion will focus on operation of the device 10. To insertthe catheter 12 into the patient's vein using the protector 10, amedical technician grasps the protector 10 and aligns the distal,piercing end of the needle 14 with the patient's vein. The medicaltechnician then punctures the patient's skin with the needle 14 andguides the needle 14 into the vein (see FIG. 6). When the needle 14 haspenetrated the vein, the flashback chamber 20 fills with blood. Thetechnician inserts the needle 14 into the vein deep enough so that thedistal end of the catheter 12 traverses a wall of the vein.

When the catheter 12 has been safely inserted into the vein, thetechnician grasps the opposed sides of the sider 18 between thetechnician's thumb and middle finger (see FIGS. 6 and 7), while thetechnician's index finger resides on top of the slider 18 and againstthe finger-press plate 22. The low-profile configuration of theflashback body 36 reduces interference with the technician's indexfinger when the slider 18 is in the extended position. In this regard,the technician has greater control over the device 10, which minimizesshaking of the needle 14 within the patient, and allows the user to moreeasily push/press against the finger-press plate 22 for moving theslider 18.

The technician then pulls the slider 18 from the extended positiontoward the retracted position, which in turn, causes the needle 14 toretract into the sheath 16. When the slider 18 reaches the retractedposition, the slider locking tab 19 is captured within the lockingcavity 21 of the distal locking element 15 so as to lock the slider 18in place on the sheath 16. Furthermore, when the needle 14 is completelyretracted into the sheath 16, the arms 66 are no longer restrained bythe needle 14, and thus spring into the open position. The catheter 12is thus released from the arms and is ready to engage with an injectionor aspiration device. The needle 14 is safely stowed within the sheath16 and the secondary arm bodies 74 block the needle 14 to prevent theneedle 14 from exiting the sheath 16. In this regard, the protector 10employs a redundant locking/needle capturing system including theengagement between the slider 18 and distal need lock 15 (i.e., thedistal lock), as well as the blockage of the needle 14 by the secondaryarm bodies 74 (i.e., the proximal lock) so as to ensure the safety ofthe medical professional and to guard against an accidental needlestick.

The particulars shown herein are by way of example and for purposes ofillustrative discussion of the embodiments of the present invention onlyand are presented in the cause of providing what is believed to be themost useful and readily understood description of the principles andconceptual aspects. In this regard, no attempt is made to show moredetails than is necessary for a fundamental understanding of thedisclosure, the description taken with the drawings making apparent tothose skilled in the art how the several forms of the presentlydisclosed invention may be embodied in practice.

What is claimed is:
 1. A low-profile universal passive protector for anIV catheter comprising: a hypodermic needle; an over-the-needle catheterremoveably disposed about the hypodermic needle; an elongate sheathdetachably engaged with the over-the-needle catheter, the elongatesheath defining a sheath cavity and a longitudinal axis; a sliderconnected to the hypodermic needle and movable along the sheath betweena first position and a second position, the hypodermic needle beingdrawn into the sheath cavity as the slider moves from the first positiontoward the second position; a finger-press plate coupled to the sheathand extending beyond the slider in a direction perpendicular to thelongitudinal axis to define a plate height; and a flashback body coupledto the slider, the flashback body and slider collectively defining acavity in fluid communication with the hypodermic needle, the flashbackbody extending from the slider in a direction perpendicular to thelongitudinal axis to define a flashback body height; the flashback bodyheight being less than the plate height.
 2. The protector as recited inclaim 1, wherein the flashback body height is less than ⅓ of the plateheight.
 3. The protector as recited in claim 1, wherein: the sliderincludes a first end and an opposing second end, the first end facingthe finger-press plate; the flashback body is coupled to the slider suchthat no portion of the flashback body extends from the slider beyond thesecond end.
 4. The protector as recited in claim 1, wherein theflashback body includes a flashback plate and a flashback cylindercoupled to the flashback plate, the flashback plate defining a planethat is substantially parallel to the longitudinal axis, and theflashback cylinder defining a cylinder axis substantially parallel tothe longitudinal axis.
 5. The protector as recited in claim 4, whereinthe flashback cylinder defines an opening which extends into theflashback plate.
 6. The protector as recited in claim 4, wherein theflashback cylinder is integrally formed with the flashback plate.
 7. Theprotector as recited in claim 6, wherein the flashback cylinder includesa curved end portion and an open end portion opposite the curved endportion, the flashback cylinder being arranged such that the curved endportion faces the finger-press plate.
 8. The protector as recited inclaim 7, wherein the curved end portion intersects with the flashbackplate at the approximate midpoint of the slider in a longitudinal crosssection generally perpendicular to the flashback plate.
 9. The protectoras recited in claim 1, further comprising a locking element coupled tothe sheath and extending into the sheath cavity, the slider engagingwith the locking element when the slider is in the second position tolock the slider in the second position.
 10. The protector as recited inclaim 9, wherein: the locking element includes a locking element lockingtab; and the slider includes a slider locking tab configured to engagewith the locking element locking tab when the slider is in the secondposition, the engagement between the locking element locking tab andslider locking tab restricting movement of the slider from the secondposition toward the first position.
 11. The protector as recited inclaim 1, wherein: the needle includes a stepped shoulder; and thecatheter includes a hardened distal tip configured to abut against thestepped shoulder during insertion of the catheter into a patient.
 12. Alow-profile universal passive protector for an IV catheter comprising: ahypodermic needle; an over-the-needle catheter removeably disposed aboutthe hypodermic needle; an elongate sheath detachably engaged with theover-the-needle catheter, the elongate sheath defining a sheath cavityand a longitudinal axis; a slider having a first end and an opposingsecond end, the first end facing the hypodermic needle, the slider beingconnected to the hypodermic needle and movable along the sheath betweena first position and a second position, the hypodermic needle beingdrawn into the sheath cavity as the slider moves from the first positiontoward the second position; a finger-press plate coupled to the sheathand extending beyond the slider in a direction perpendicular to thelongitudinal axis to define a plate height; and a flashback body coupledto the slider, the flashback body and slider collectively defining acavity in fluid communication with the hypodermic needle, the entiretyof the flashback body residing between the first and second ends of theslider.
 13. The protector as recited in claim 11, wherein the flashbackbody includes a flashback plate and a flashback cylinder coupled to theflashback plate, the flashback plate defining a plane that issubstantially parallel to the longitudinal axis, and the flashbackcylinder defining a cylinder axis substantially parallel to thelongitudinal axis.
 14. The protector as recited in claim 12, wherein theflashback cylinder defines an opening which extends into the flashbackplate.
 15. The protector as recited in claim 12, wherein the flashbackcylinder is integrally formed with the flashback plate.
 16. Theprotector as recited in claim 14, wherein the flashback cylinderincludes a curved end portion and an open end portion opposite thecurved end portion, the flashback cylinder being arranged such that thecurved end portion faces the finger-press plate.
 17. The protector asrecited in claim 15, wherein the curved end portion intersects with theflashback plate at the approximate midpoint of the slider in alongitudinal cross section generally perpendicular to the flashbackplate.
 18. The protector as recited in claim 12, further comprising alocking element coupled to the sheath and extending into the sheathcavity, the slider engaging with the locking element when the slider isin the second position to lock the slider in the second position.
 19. Alow-profile universal passive protector for use with an over-the-needlecatheter, the universal passive protector comprising: a hypodermicneedle insertable through the over-the-needle catheter; an elongatesheath detachably engaged with the over-the-needle catheter, theelongate sheath defining a sheath cavity and a longitudinal axis; aslider connected to the hypodermic needle and movable along the sheathbetween a first position and a second position, the hypodermic needlebeing drawn into the sheath cavity as the slider moves from the firstposition toward the second position; a finger-press plate coupled to thesheath and extending beyond the slider in a direction perpendicular tothe longitudinal axis to define a plate height; and a flashback bodycoupled to the slider, the flashback body and slider collectivelydefining a cavity in fluid communication with the hypodermic needle, theflashback body extending from the slider in a direction perpendicular tothe longitudinal axis to define a flashback body height; the flashbackbody height being less than the plate height.
 20. The protector asrecited in claim 19, wherein: the slider includes a first end and anopposing second end, the first end facing the finger-press plate; theflashback body is coupled to the slider such that no portion of theflashback body extends from the slider beyond the second end.